Light guide plate, display device and detection method for printing positioning of light guide plate

Abstract

The invention relates to a light guide plate, a display device and a detection method for printing positioning of the light guide plate. A dimming figure is printed on the surface of the light guide plate and has set first offset tolerance, the surface of the light guide plate is provided with a first lateral side and a second lateral side opposite to the first lateral side, a first strip-shaped positioning reference figure and a second strip-shaped positioning reference figure are further printed on the surface of the light guide plate, the first positioning reference figure is parallel to the first lateral side, the second positioning reference figure is parallel to the second lateral side, and the sum of the distance between the inner lateral side of the first positioning reference figure and the first lateral side and the distance between the inner lateral side of the second positioning reference figure and the second lateral side is the double of the first offset tolerance. The dimming figure and the positioning reference figure are printed on the surface of the light guide plate together, whether printing positioning of the dimming figure meets the set offset tolerance or not can be simply judged by means of visual testing according to whether the positioning reference figures are imperfect or not, and the problem of difficulty in detecting printing positioning of the light guide plate is solved.

Description

technical field [0001] The present invention relates to a light guide plate, a display device, and a detection method for printing positioning of the light guide plate, in particular to a light guide plate, a display device, and a detection method for printing positioning with a positioning reference map for visual inspection. Background technique [0002] Liquid crystal display devices are currently the most widely used flat display devices, such as mobile phone display screens, liquid crystal displays, and liquid crystal televisions. The backlight module is one of the important components of the liquid crystal display device. Generally speaking, the backlight module is composed of a light guide plate, a diffusion sheet, a reflection sheet, and a light source. The light guide plate is used to guide the light generated by the light source to the display panel. After the light passes through the display panel, the user can see the content displayed on the liquid crystal panel...

AI Technical Summary

Problems solved by technology

In the process of screen printing, due to factors such as printing equipment, personnel operation, and production environment, it is easy to cause misalignment of the printing position of the screen

Deviations between the dot position and the design value will result in poor display quality, so it is often necessary to use a magnifying glass or a 3D measuring instrument to measure the size to determine whether the ink dot position of the light guide plate is accurate

In the production process, due to the time required for measurement, when an abnormality is found, a large number of defective products have been produced on the production line, which will cause a lot of waste

In addition, due to the different structural design of the backlight module, the dot spacing value is not fixed during the optical design of the light guide plate, so that the dot positioning size of different light guide plates is different. The size of the light guide plate of each model needs to be defined, which cannot achieve simplified production. line management

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